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| n | a(n) |
|---|---|
| 1 | 55 |
| 2 | 274 |
| 3 | 773 |
| 4 | 1793 |
| 5 | 3840 |
| 6 | 7936 |
| 7 | 16128 |
| 8 | 32512 |
| 9 | 65280 |
| 10 | 130816 |
| 11 | 261888 |
| 12 | 524032 |
| 13 | 1048320 |
| 14 | 2096896 |
| 15 | 4194048 |
| 16 | 8388352 |
| 17 | 16776960 |
| 18 | 33554176 |
| 19 | 67108608 |
| 20 | 134217472 |
| 21 | 268435200 |
| 22 | 536870656 |
| 23 | 1073741568 |
| 24 | 2147483392 |
| 25 | 4294967040 |
| 26 | 8589934336 |
| 27 | 17179868928 |
| 28 | 34359738112 |
[55,274,773,1793,3840,7936,16128,32512,65280, 130816,261888,524032,1048320,2096896,4194048, 8388352,16776960,33554176,67108608,134217472, 268435200,536870656,1073741568,2147483392, 4294967040,8589934336,17179868928,34359738112] |